WO2018226409A1 - Atténuation de vides de bord de fuite dans une impression flexographique - Google Patents

Atténuation de vides de bord de fuite dans une impression flexographique Download PDF

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Publication number
WO2018226409A1
WO2018226409A1 PCT/US2018/034093 US2018034093W WO2018226409A1 WO 2018226409 A1 WO2018226409 A1 WO 2018226409A1 US 2018034093 W US2018034093 W US 2018034093W WO 2018226409 A1 WO2018226409 A1 WO 2018226409A1
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WO
WIPO (PCT)
Prior art keywords
image
pixel
pattern
pixels
regions
Prior art date
Application number
PCT/US2018/034093
Other languages
English (en)
Inventor
Richard R. BIELAK
Original Assignee
Eastman Kodak Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Company filed Critical Eastman Kodak Company
Priority to EP18730598.2A priority Critical patent/EP3634759B1/fr
Publication of WO2018226409A1 publication Critical patent/WO2018226409A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/12—Printing plates or foils; Materials therefor non-metallic other than stone, e.g. printing plates or foils comprising inorganic materials in an organic matrix
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor
    • G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
    • G03F7/2014—Contact or film exposure of light sensitive plates such as lithographic plates or circuit boards, e.g. in a vacuum frame
    • G03F7/2016—Contact mask being integral part of the photosensitive element and subject to destructive removal during post-exposure processing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor
    • G03F7/2022—Multi-step exposure, e.g. hybrid; backside exposure; blanket exposure, e.g. for image reversal; edge exposure, e.g. for edge bead removal; corrective exposure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
    • H04N1/4057—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern the pattern being a mixture of differently sized sub-patterns, e.g. spots having only a few different diameters

Definitions

  • the present invention relates to a method forming an image on a flexographic plate.
  • a relief plate includes raised relief features, which are raised above the plate floor. It is the raised features that accept and transfer ink to the substrate.
  • flexographic prepress process with chemical etching, there is no possibility of fine control of relief properties other than the relief depth.
  • Flexographic printing uses a flexible relief plate 20 to print on a wide variety of substrates including paper, cardboard, plastic, and metal films.
  • a simplified diagram of a flexographic printing press 30 is shown in FIG. 1.
  • Ink 10 in a fountain pan 26 is taken up by a rubber fountain roller 12 and transferred to the surface of the anilox roller 14.
  • the surface of the anilox roller 14 is composed of an array of indented cells that allow careful metering of the ink volume.
  • a doctor blade 16 removes any excess ink 10 from the anilox roller 14 before the ink 10 is transferred to the printing plate cylinder 18.
  • Mounted on the plate cylinder 18 is a flexographic printing plate 20, which can also be referred to as a flexible relief plate.
  • the final step transfers the ink 10 from the plate 20 to substrate 22, with impression cylinder 24 supplying support for the substrate 22.
  • the process used to produce an image on a flexible relief plate 20 typically includes the following steps:
  • the back exposure in step 1 is used to establish the floor 220 of the plate 20.
  • the intensity of the exposure decreases as the illumination penetrates the plate because of absorption in the plate material. Once the intensity drops below a threshold value, there is insufficient cross linking in the polymer comprising the plate, and the remaining under-exposed polymer can be washed away. This is typically the top 0.5 mm of the plate.
  • the front of the plate is exposed through an image layer with enough intensity so that sufficient cross- linking occurs all the way down to the plate floor 220.
  • a cone of UV light (typically with an angle of about 40 degrees from a normal to the plane) propagates through the plate 20 forming cone-shaped relief dots.
  • a cross section of an exemplary plate 20 is shown in FIG. 2. The following features are depicted in the cross section: a solid area raised feature 204; an isolated dot raise feature 208; and a raised feature 212 including an array of closely spaced dots created by a halftone screen.
  • the height of the plate relief above the plate floor 220 is shown by relief depth 216.
  • Ink uniformity and density can be improved if a surface pattern or surface texture is applied to the flat tops of the relief pattern as shown in the
  • FIG. 3 which compares a no surface texture pattern 302, a conventional plate cell pattern 303 and a checkerboard surface texture 304.
  • the checkerboard surface texture 304 in this example is provided by a Kodak DigiCap NX Screening process which forms a stretched checkerboard pattern 304 composed of
  • Such a fine texture pattern has an additional advantage in that it allows the edges of printing features to be well defined.
  • the pattern does have its limits. When printing on plastic substrates, voids can appear in large features due to air entrapment. The pattern can also perform poorly if large volumes of ink need to be transferred to the substrate 22. To eliminate these problems, a coarser pattern is required. However, a coarser pattern will compromise edge definition.
  • a preferred method combines a fine texture pattern at the edge of printing features with a coarser pattern in the interior of features as described in commonly-assigned U.S. Patent 9,235,126 to R. Bielak et al., entitled
  • FIG. 4 a fine texture pattern 404 is applied near the edges of the relief features 402 and a coarse texture pattern 408 is applied to the interior of the relief features 402.
  • FIG. 5 is similar to FIG. 4 except that the coarse texture pattern 408 is coarser than that of FIG. 4.
  • a weakness of this method is that the interior pattern cannot be simultaneously optimized for both uniform ink deposition and resistance to voids at the trailing edge of large relief features 402.
  • the present invention represents a method for forming a flexographic plate including:
  • the image pattern including image features to be formed on the flexographic plate, the image pattern including an array of image pixels, wherein the image pixels include printing pixels corresponding to portions of the image pattern where ink is to be printed on a substrate by the flexographic plate;
  • edge regions and the interior regions are separated by gap regions
  • This invention has the advantage that voids along the trailing edge of relief features are substantially eliminated by introducing a gap region between an edge region with a fine texture pattern and an interior region with a coarser texture pattern.
  • the textured image pattern is simultaneously optimized for both uniform ink deposition and resistance to voids at the trailing edge of large relief features.
  • FIG. 1 shows simplified diagram of a flexographic printing press
  • FIG. 2 illustrates a cross section through an exemplary flexographic printing plate
  • FIG. 3 shows textures applied to the raised features of a flexographic printing plate
  • FIG. 4 shows a textured image pattern where a fine texture pattern is applied to the edges of the image features and a coarse texture pattern is applied to the interior of the image features;
  • FIG. 5 shows a textured image pattern similar to FIG. 4 except that a coarser pattern is applied to the interior of the image features;
  • FIG. 6 shows a block diagram of an exemplary plate forming system including a digital front end driving an imaging device
  • FIG. 7 shows a schematic diagram of an imaging system including a laser imaging head situated on the imaging carriage that writes on a plate mounted on an imaging cylinder;
  • FIG. 8 shows an exemplary rendered image pattern
  • FIG. 9 shows a rendered image pattern on a flexographic plate
  • FIG. 10 shows a textured image pattern formed by applying a fine texture pattern to the edge regions of the image features and a coarse texture pattern to the interior regions of the image features with a gap between the two regions;
  • FIG. 11 shows cross sections through a relief feature illustrating characteristics of the edge region, the interior region and the gap region
  • FIG. 12 shows a block diagram illustrating the formation of a textured image pattern in accordance with an exemplary embodiment
  • FIG. 13 shows exemplary fine and coarse texture patterns
  • FIG. 14 illustrates the use of two pixel windows to classify pixels as belonging to an edge region, an interior region or a gap region.
  • FIG. 6 shows an exemplary plate forming system 600 for forming flexographic printing plates.
  • the plate forming system 600 includes an imaging device 608 which is driven by a digital front end (DFE) 604.
  • the DFE 604 receives printing jobs in a digital form from desktop publishing (DTP) systems (not shown), and renders the digital information for imaging.
  • the rendered information and imaging device control data are communicated between DFE 604 and imaging device 608 over interface line 612.
  • FIG. 7 shows an exemplary imaging device 608 including imaging system 700.
  • the imaging system 700 includes an imaging carriage 732, on which an imaging head 720 is mounted.
  • the imaging head 720 is controlled by controller 728.
  • the imaging head 720 is configured to image onto a photosensitive substrate 708.
  • the substrate 708 can be a film that can be attached as a mask to a flexographic plate, or alternatively the substrate 708 can be a flexographic plate that is directly imaged by the imaging system 700.
  • the substrate 708 is mounted on a rotating cylinder 704 for exposure.
  • the imaging carriage 732 is adapted to move substantially in parallel to cylinder 704 guided by an advancement screw 716.
  • the substrate 708 is imaged by imaging head 720 to form imaged data 712 on the substrate 708.
  • FIG. 8 shows a rendered image pattern 800.
  • the rendered image pattern 800 was prepared by DFE 604, typically using a halftone process, to be imaged onto the substrate 708.
  • FIG. 9 shows an imaged substrate 900 including imaged data 712 corresponding to the rendered image pattern 800 (FIG. 8) which has been imaged by the imaging head 720 (FIG. 7) onto the substrate 708.
  • the imaged substrate 900 is used to form the flexographic printing plate 20.
  • the imaged substrate 900 is a film in can be developed to produce a mask that can be used to expose the plate, which is subsequently processed to form the raised features.
  • the imaged substrate 900 is the plate itself, it can be processed directly to form the raised features.
  • voids can sometimes appear on the trailing edge of large solid relief areas. These voids are formed due to entrapment of air bubbles between the plate 20 and the substrate 22. It has been shown that this problem can be mitigated by providing a fine texture pattern 404 along the edges of the relief pattern 402 including slightly deeper valleys in the texture pattern, and providing a coarse texture pattern 408 including larger gaps between the peaks in the interior of the relief pattern 402 (see FIGS. 4-5). This enables ink and air to flow more freely. Such textured patterns are well-suited to printing process inks on various substrates.
  • coarse texture pattern 408 in the interior regions of the relief features 402 of FIG. 5 significantly reduces voids on the trailing edge of solid relief features 402, but the valleys are too deep and wide to allow a uniform deposition of ink. Consequently, the solid density of the printed ink is reduced.
  • the coarse texture pattern 408 in the interior regions of the relief features 402 of FIG. 4 has valleys that are both narrower and shallower than that of FIG. 5. This results in a more uniform distribution of ink, thereby increasing the solid density significantly. However, these shallow valleys do not allow the trapped air and ink to flow freely enough, and consequently voids are only partially eliminated. It has been found that coarse texture patterns 408 cannot be devised that simultaneously optimize for ink density and void suppression.
  • FIG. 10 shows a textured image pattern 1000 formed using the method of the present invention.
  • the textured image pattern 1000 substantially eliminates trailing edge voids by forming two texture patterns separated by a gap region 1004.
  • the first texture pattern is a fine texture pattern 1008 that is optimized for the edges of the relief features 1002.
  • the second texture pattern is a coarse texture pattern 1012 that is optimized for the interior of the relief features 1002.
  • the form of the texture patterns can be adapted to a particular application.
  • the gap region 1004 does not need to be contiguous, it can be interrupted occasionally with peaks 1016.
  • the width of the gap region 1004 is selected to be wide enough to improve ink and trapped air flow yet narrow enough to allow ink to bridge the gap.
  • gap width For typical process ink volumes, it has been found that a gap width of approximately 10 microns produces good results. Higher volume inks such as white and spot colors may require greater wider gaps consistent with their volume. In various applications, typical gap widths would be between 5 microns and 30 microns.
  • FIG. 11 shows cross-sections through a corner of a relief feature
  • the A- A cross-section 1104 shows the peaks 1108 and valleys 1112 of the texture pattern in the edge region 1101 (e.g., fine texture pattern 1008 of FIG. 10).
  • the B-B cross-section 1116 shows peaks 1120 and valleys 1124 of the texture pattern in the interior region 1103 (e.g., coarse texture pattern 1012 of FIG. 10).
  • B-B cross-section 1116 shows a deeper valley 1128 corresponding to the gap region 1102. It has been found that this deeper valley 1128 allows better ink and air flow reducing the formation of voids in the trailing edge of the relief features 1100.
  • FIG. 12 is a block diagram that shows the steps of an exemplary method for forming textured image patterns in accordance with the present invention.
  • An image pattern 1204 is provided including a set of image features.
  • the image pattern 1204 is generally a binary image defined by an array of binary image pixels.
  • the image features typically include halftone dot patterns, as well as other types of image features such as text characters and lines.
  • the image pixels of the image pattern 1204 have two states:
  • the “exposed pixels” are those pixels where the imaging system 700 (FIG. 7) will expose the photosensitive substrate 708 to provide the imaged data 712. Generally, the "exposed pixels” will correspond to those regions of the image pattern 1204 where it is intended to transfer ink from the flexographic printing plate 20 (FIG. 1) onto the substrate 22.
  • the two states can alternately be referred to as “on pixels” and “off pixels” or “printing pixels” and “non-printing pixels.”
  • An edge detection process 1206 is applied to the image pattern 1204 to determine an edge pixel mask 1208 specifying edge regions corresponding to edge pixels of the image features, and an interior pixel mask 1212 specifying interior regions corresponding to interior pixels of the image features. The edge regions and the interior regions are separated by gap regions.
  • a fine texture pattern 1216 is applied to edge regions specified by the edge pixel mask 1208 to create a fine-patterned edge structure 1224.
  • the edge pixel mask 1208 and the fine texture pattern 1216 are both binary images.
  • the fine texture pattern 1216 can be applied by performing a logical "AND" operation to the corresponding pixels.
  • a pixel in the fine-patterned edge structure 1224 will be "on” if the corresponding pixels in both the fine texture pattern 1216 and the edge pixel mask 1208 are both in the "on” state.
  • a coarse texture pattern 1220 is applied to interior regions specified by the interior pixel mask 1212 to create a coarse- patterned interior structure 1228.
  • the image resolution that is used to perform the edge detection process 1206 may be different than the image resolution used to apply the texture patterns.
  • the image pattern 1204 may be a 2400 dpi pattern having pixels that are approximately
  • the edge detection process 1206 can be applied at this resolution to produce an edge pixel mask 1208 and an interior pixel mask 1212 with this same resolution.
  • the fine texture pattern 1216 and the coarse texture pattern 1220 can then be specified at some other resolution. For example, in an exemplary embodiment these texture patterns can be specified with pixels that are
  • this change in resolution can be accomplished by replicating each of the pixels in the edge pixel mask 1208 and the interior pixel mask 1212 in one direction before performing the AND operations.
  • FIG. 13 shows a close-up of the fine texture pattern 1216 and the coarse texture pattern 1220 used in an exemplary embodiment.
  • These texture patterns are defined on a pixel grid with 5 x 10 micron pixels adapted to be written with a 2400x4800 dpi imaging device.
  • the fine texture pattern 1216 includes a checkerboard pattern of "on" pixels.
  • the coarse texture pattern 1220 includes a regular pattern of "on” pixels that are more sparsely distributed than for the fine texture pattern 1216. This coarse texture pattern 1220 can be referred to as a "sparse checkerboard.”
  • the fine texture pattern 1216 and the coarse texture pattern 1220 are preferably specified as a pixel array which is tiled across the image in a repeating fashion.
  • the grid shown in bold shows how the texture patterns are overlaid on the pixels of the image pattern 1204 (FIG. 12). It can be seen that each 10x 10 micron in the image pattern 1204 corresponds to two 5 x 10 micron pixels in the texture patterns.
  • the terms "fine” and “coarse” as used here are relative terms which reflect that the coarse texture pattern 1220 has a coarser texture than the fine texture pattern 1216.
  • a texture can be said to be “coarser” if it has a lower dominant frequency, or if the average spacing between the "on" pixels (or groups of "on” pixels) is larger. For example, in the patterns of FIG. 13, the fine texture pattern 1216 has a dominant frequency that is half the writing frequency, and the coarse texture pattern 1220 has a dominant frequency that is one third of the writing frequency.
  • the final step is to combine the fine-patterned edge structure 1224 and the coarse-patterned interior structure 1228 into a textured image pattern 1232.
  • This can be accomplished by performing a logical "OR" operation to the corresponding pixels.
  • a pixel in the textured image pattern 1232 will be "on” if a corresponding pixel in either the fine-patterned edge structure 1224 or the coarse-patterned interior structure 1228 is in the "on” state.
  • the textured image pattern 1232 is used to form the flexographic plate 20 (FIG. 1) by using an imaging system 700 (FIG. 7) to write the textured image pattern 1232 onto a photosensitive substrate.
  • the photosensitive substrate 708 can be an undeveloped flexographic plate, or can be a film that is used to form the flexographic plate.
  • the "on" pixels in the textured image pattern 1232 correspond to the pixel locations where the imaging system exposes the photosensitive substrate.
  • the edge detection process 1206 selects pixels in the image pattern 1204 to be part of the edge region or interior region based on their proximity to an edge of a relief feature.
  • the edge detection process 1206 uses a 3 x3 pixel window 1320 and a 5 x5 pixel window 1324 (with the corners removed) as illustrated in FIG. 14. These pixel windows produce a gap region with a gap width of about 10 microns for image resolutions of
  • pixel window shapes can also be used in accordance with other embodiments of the invention, where the size and shape of the pixels windows 1320, 1324 will control the width and characteristics of the edge regions and the gap regions. In general, the pixel window 1324 should be larger than the pixel window 1320. In alternate embodiments, any other appropriate image analysis method known in the art can be used to identify the edge regions, interior regions and gap regions.
  • the pixel windows 1320, 1324 are overlaid on the pixels of the image pattern 1204 (FIG. 12) to classify edge pixels and interior pixels.
  • the center pixel is deemed to be an interior pixel belonging to an interior region (e.g., see mask position 1316). If the center pixel is an exposed pixel and at least one of the other pixels in the 3 x3 pixel window 1320 is not an exposed pixel, then the center pixel is deemed to be an edge pixel belonging to an edge region (e.g., see mask position 1308).
  • the center pixel is deemed to be a gap pixel belonging to a gap region (e.g., see mask position 1312). All other pixels in the image are deemed exterior pixels (e.g., see mask position 1304).
  • the result of this operation is to designate an interior pixel mask 1212 (FIG. 12) corresponding to all the identified interior pixels and an edge pixel mask 1208 (FIG. 12) corresponding to all the identified edge pixels.
  • the textured image pattern 1232 is formed by replacing exposed pixels in the rendered image pattern 1204 (FIG. 12) with corresponding pixels from the fine texture pattern 1216 and the coarse texture pattern 1220. If an exposed pixel in the rendered image pattern 1204 belongs to the edge pixel mask 1208 then that pixel is replaced by the
  • DFE digital front end

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Methods (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)

Abstract

L'invention concerne un procédé pour former une plaque flexographique pour un motif d'image comprenant des caractéristiques d'image. Le motif d'image comprend un réseau de pixels d'image, les pixels d'image comprenant des pixels d'impression correspondant à des parties du motif d'image où de l'encre doit être imprimée sur un substrat par la plaque flexographique. Des régions de bord et des régions intérieures des caractéristiques d'image sont identifiées, lesquelles sont séparées par des régions d'espacement. Un motif de texture fine (1008) est appliqué aux régions de bord et un motif de texture grossière (1012) est appliqué aux régions intérieures pour former un motif d'image texturé qui est utilisé pour former la plaque flexographique. Aucun motif de texture n'est appliqué aux régions d'espacement (1004), laissant ainsi des espaces entre les régions de bord et les régions intérieures des caractéristiques d'image.
PCT/US2018/034093 2017-06-06 2018-05-23 Atténuation de vides de bord de fuite dans une impression flexographique WO2018226409A1 (fr)

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EP18730598.2A EP3634759B1 (fr) 2017-06-06 2018-05-23 Atténuation de vides de bord de fuite dans une impression flexographique

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US15/616,134 2017-06-06
US15/616,134 US10150319B1 (en) 2017-06-06 2017-06-06 Mitigating trailing edge voids in flexographic printing

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US11691408B2 (en) 2020-05-26 2023-07-04 Esko Software Bv System and method for designing and creating a printing plate

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Publication number Priority date Publication date Assignee Title
WO2022117555A1 (fr) 2020-12-01 2022-06-09 Esko-Graphics Imaging Gmbh Système et procédé pour atténuer les vides de bord de fuite en impression flexographique

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US20100224091A1 (en) 2009-03-06 2010-09-09 Zwadlo Gregory L Trailing edge pattern for relief plate feature
US9235126B1 (en) 2014-10-08 2016-01-12 Eastman Kodak Company Flexographic surface patterns
US20160221379A1 (en) 2013-10-17 2016-08-04 Fujifilm Corporation Flexo printing plate

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Publication number Priority date Publication date Assignee Title
US20100224091A1 (en) 2009-03-06 2010-09-09 Zwadlo Gregory L Trailing edge pattern for relief plate feature
US20160221379A1 (en) 2013-10-17 2016-08-04 Fujifilm Corporation Flexo printing plate
US9235126B1 (en) 2014-10-08 2016-01-12 Eastman Kodak Company Flexographic surface patterns

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11691408B2 (en) 2020-05-26 2023-07-04 Esko Software Bv System and method for designing and creating a printing plate

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EP3634759A1 (fr) 2020-04-15
EP3634759B1 (fr) 2022-07-13
US10150319B1 (en) 2018-12-11
US20180354288A1 (en) 2018-12-13

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